Callantsoog opens Den Helder to the Orangist flag

At the Battle of Callantsoog, also known as Groote Keeten, the British had about 12,000 troops against 10,000 Batavian defenders, but too few boats to land more than roughly 2,500 at a time. Brave but poorly concentrated Batavian attacks committed battalions separately, allowing larger British formations to defeat each local effort despite only a modest overall numerical advantage. Naval gunfire supported the advance, while the Dutch command abandoned Den Helder as untenable and yielded a prepared fortress without a siege. Flying the Prince of Orange's flag over the captured forts then made the position appear Dutch and Orangist rather than simply foreign-occupied, undermining Batavian loyalty at sea through symbolism as much as force.